%I #6 Oct 28 2013 12:07:27
%S 4,1,0,1,3,7,12,18,26,35,45,56,69,83,98,114,131,150,170,191,213,236,
%T 260,286,313,341,370,400,431,463,497,532,568,605,643,682,722,763,806,
%U 850,895,941,988,1036,1085,1135
%N Second differences are 2,2,1,2,1,1,2,1,1,1,2,1,1,1,1,2,1,1,1,1,1,2,.. (A035214).
%Y Different from A005228. Cf. A035254.
%K nonn,easy
%O 0,1
%A Robet Bronson (bob(AT)bronsons.com)